Telegraph apparatus.



H. M. BOAL.

TELEGRAPH APPARATUS.

APPLICATION m5!) JUNE 2, I916.

1,220,066. Patented Mar. 20,1917.

HUGH M. BOAL, F TITUSVILLE, PENNSYLVANIA.

TELEGRAPH APPARATUS.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed June 2, 1916. Serial No. 101,362.

To all whom it may concern:

Be it known that I, HUGH M. BOAL, a citizen of the United States of America, residing at Titusville, in the county of Crawford and State of Pennsylvania, have invented new' and useful Improvements in Telegraph Apparatus, of which the following is a specification.

This invention relates to improvements in telegraph apparatus and has particular application to apparatus for use on normally closed telegraph lines.

In carrying out the present invention, it is my purpose to provide apparatus for use on normally closed telegraph lines whereby the current flowing through the line will be automatically reduced when the line is not in service so that the relays controlling the local circuits Will be weakened to such an extent as to permit the local circuits to open, thereby preventing waste of current in such circuits.

It is also my purpose to provide apparatus of the class described which will operate automatically, whenone of the keys on the line is opened, to cut the resistance out of v (the line, thereby permitting the normal current to flow through the line so that the relays controlling the local sounder circuits may be properly energized to facilitate the transmission of messages.

With the above and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claims.

. In the accompanying drawing;

Figure 1 is a diagrammatic view of telegraph apparatus constructed in accordance with the present invention, the same being shown as connected in the line.

4 Fig. 2 is a fragmentary sectional view "through the main controlhng relay of the apparatus.

Referring now to the drawing in detail,

1 designates a normally closed telegraph line including, in series, a source of energy 2, keys 3, local sounder controlling relays 4, and a high resistance 5, the latter being of the adjustable type. Each relay 4 controls a local circuit 6 including a sounder 7 and a source of electrical energy 8. Under normal conditions, when the line is out of service, the keys 3 are closed and the cup.- jrent from the source of energy 2 flows through the relays i, the keys and the resistance 5, and owing to the resistance 5 the to open position under the action of their respective springs, thereby holding the'local circuits 6 open and preventing waste of current in such circuits.

Located in the vicinity of one of .the local sounder circuits is a main controlling relay 9 including, in the present instance, two coils, as shown in Fig. 2, and an armature 10 disposed below the poles of the magnets of the relay 9 and under the influence thereof and mounted centrally in a bracket 11 that is pivoted upon a horizontal pivot pin 12 extending through the pole of the magnets of the relay 9 whereby the armature may be rocked to move one end up and the other end down when the relay is energized, and vice versa, when the relay is de'nergized. In the present instance, this relay 9 is suspended within a casing 13 and the upper ends of-the coils of such relay are secured to the top wall (if the casing. Secured to one end wlall of the casing in the path of movementof the upwardly moving end of'the armature 10 is a contact 14, while secured to the bottom wall of the casingin the path of thedownwardly mov-.

ing end of the a'rmat'ure is a contact 15. The terminals of the relay 9 are connected, by means of conductors 1'6, with the armature contacts, respectively, of the relay controlling the adjacent sounder circuit, while the contact 14 is connected to the line, by means of a conductor 17, at one side of the resistance 5, and the contact 15 connected to the line, by means-0f a conductor 18, at the other side of the resistance 5. Connected to the armature 10 is one terminal of a resistance 19 and the other terminal of such resistance 19 is connected tothe line 1 at the side of the adjacent relay 4 opposite from the conductor 17. r

In the present instance, one endportion of the armature 10 is equipped with a" leaf spring 20 that bears against a block '21 secured to the bottom wall of the casing 13 whereby the armature 10 may be held in horizontal position when the relay 9 is deenergized.

In practice, as long as the line is out of service the resistance 5 is connected in sek'ries in the line, thereby weakening the local sounder controlling relays at, as previously described. When, however, one of the keys is opened and the line broken, the relays i are denergized and upon the deene-rgization of the particular relay t controlling the relay 9, the armature of such relay a is pulled to open position, thereby connec ing the relay 9, in series with the local sounder circuit. Upon the energization of the relay 9, the armature 1O thereof-is swung to engage the ends with the contacts 14 and 15 respectively, thereby outing the resistance 5 out of the line, current flowing from one side of .the source of energy 2, through the key 3, the relay a, conductor 17, contact ll, armature 10, contact 15 and conductor 18, and then through the line to ground back to the other side of the source of energy 2. A part of this current also flows through the resistance 19 t0 the line, thereby preventing too much local circuit controlling relays,

cur-rent from flowing through the adjacent relay 4.

The relay 4: controlling the relay 9 is preferably of greater resistance than the other being of about one thousand ohms to one hundred and fifty of each of the other relays l. The resistance 5 is of greater resistance than the resistance 19, being in the ratio of about twenty-five the interyal between the transmission of the dots and dashes.

While I have herein shown and described the preferred form of my invention by way of illustration, I wish it to be understood that 1 do not limit or confine myself to the precise details of construction herein described and delineated, as modification and variation may be made within the scope of 1. The combination with the claims and without departing from the spirit of the invention.

I claim:

a normally closed telegraph line, of local circuit-controlling relays in said line, one of said relays being of relatively high resistance, a resistance in said line normally in series with Copies of this patent may be obtained .relays will be weakened to such an e for live cents each, by addressing the tlommissioner Weshinfion, E). (5.

the local circuit-controlling relays to the latter whereby all of the low res to permit the local circuits controlled t r. by to remain open, and means for cut 7 said resistance out of the main line auto matically when said main line is in service;

2. The combination with a norrally closed telegraph line, of local circuit-controlling relays in said line, one of said lays being of relatively high resistance, a resistance in said line normally in series with the local circuit controlling relays to weaken the latter whereby all of the low resistance relays will be weakened to such an extent as to permit the local circuits controlled thereby to remain open, and means under the con' trol of said relatively high resistance relay for cutting said resistance out of the main line automatically when said main line is in service.

3. The combination with a normally closed telegraph line, of local circuit-coir trolling relays in said line, one of said relays being of relatively high resistance, a resistance in said line normally in series wi h the local circuit controlling relays to weaken the latter whereby all of the low resistance relays will be weakened to such an extent as to permit the local circuits controlled thereby to remain open, and a relay under the control. of said'relatively high resistance relay for cutting said resistance out of the main line automatically when said main line is in service.

l. The combination with a normally closed telegraph line, of a resistance in said line normally in series with the local soundcontrolling relays to weaken the latter whereby the'local circuits may be held open, and means for cutting said resistance out of the circuit automatically when said main line is in service.

5. The combination 'with a normally closed telegraph line, of a resistance in said line normally in series with the local soundcontrolling relays to weaken the latter whereby the local circuits may be held open, and means under the control of said main line for cutting said resistance out of the main line when said main line is in service.

In testimony whereof I ailix my signature.

HUGH M. BOAT oi Eatcnts, 

